Production of an aluminium alloy



Patented May 23, 1933 UNITED STATES PATENT? OFFICE DAVID RONALD TULLIS,OF SUTTON COLDFIELD, AND PERCY OAKLEY, OF LIVERPOOL, ENGLAND PRODUCTIONOF AN ALUMINTUM ALLOY No Drawing. Application filed September 8, 1932,Serial No. 632,184, and in Great Britain October 27, 1931.

This invention relates to the production the remainder beingsubstantially alumin of a refined aluminium alloy having stainium.

less properties as well as hardness. The improved alloy contains,

5 aluminium, magnesium, chromium, manganese and titanium, and may alsocontain a small quantity of boron, as Well as iron and I silicon.

In the production of the improved alloy 1 a quantity ofchromiuni-aluminium alloy rich in chromium is added to a bath of alreadymolten aluminium, the heating being continued so that the moltencondition is maintained. There is then added to the 1 bathmanganese-titanium-aluminium alloy rich in manganese and titanium. Thenele mental magnesium is added, the molten condition being maintained.

The vapour of boron trichloride or the volatile halide of a metal havinga grainrefining influence may then be introduced into the bath asdescribed for example in the specification of U. S. Letters Patent No.1,636,881 issued 26th July, 1927.

By way ofcxample suitable proportions of the ingredlents of the alloyare as follows Percent Chromium 1 to 1 3o Manganese .2to2 litanlum 1 to1 Magnesium 5to,5

the remainder being aluminium, and, in certain cases, small quantitiesof boron or other element introduced by the refining operation.

Iron and silicon are usually present as impurities in the aluminium, up.to 35% of iron and .75% of silicon.

\Ve claim:-

Magnesium 5 t0 5 testimony whereof we have signed our besides names tothis specification.

D. R. TULLIS. PERCY OAKLEY.

